Connected: An Internet Encyclopedia
RFC 1771 - 5.1.4 MULTI_EXIT_DISC

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### 5.1.4 MULTI_EXIT_DISC

The MULTI_EXIT_DISC attribute may be used on external (inter-AS) links to discriminate among multiple exit or entry points to the same neighboring AS. The value of the MULTI_EXIT_DISC attribute is a four octet unsigned number which is called a metric. All other factors being equal, the exit or entry point with lower metric should be preferred. If received over external links, the MULTI_EXIT_DISC attribute may be propagated over internal links to other BGP speakers within the same AS. The MULTI_EXIT_DISC attribute is never propagated to other BGP speakers in neighboring AS's.

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Connected: An Internet Encyclopedia
RFC 1771 - 5.1.4 MULTI_EXIT_DISC